Coffee-mill



ITLVe -(No Model.)

B. L. MOGLAIN. COFFEE MILL. No. 419,701. Patented Jan.21,1890.

FIG.

FIG-.1.

N. PETERS PhohrLnhngmpher, Washinglun. n C.

UNITED STATES PATENT OFFICE.

EDWARD L. MCOLAIN, OF GREENFIELD, OHIO.

COFFEE-MILL.

SPECIFICATION forming part of Letters Patent No. 419,701, dated January 21, 1890. Application filed October 25, 1889. Serial No. 328,124- (ITo model.)

To all whom it may concern.-

Be it known that I, EDWARD L. MCOLAIN, a citizen of the United States, residing at Greenfield, in the county of Highland and State of Ohio, have invented certain new and useful Improvements in Coffee-Mills; and I do hereby declare the following to be a full,

clear, and exact description of the invention,

' being hereinafter more fully described, and

pointed out in the claims.

In the annexed drawings, Figure 1 is a vertical section of a coifee-mill embodying my improvements, said section being taken in the plane of the handle and the hopper being closed by its swing-lid. Fig. 2 is a plan of the mill, its shaft and shaft-bearing being sectioned transversely and the position of the operating-crank being indicated by dotted lines.

A is the mill-hopper, having at bottom any approved form of concave a and at top an annular flange B, resting upon the cover 0 of mill-box D, the latter being provided with a customary door and a suitable receptacle for the ground coffee.

E is the dome-shaped hopper-cover, having at its base an annular flange e, of practically the same shape and size as the hopper-flange B, which flanges B e are secured together and also fastened to the mill-box by screws b.- This fixed cover E extends a little more than half-way over the hopper A and has at its center a neck F, screw-threaded internally, as at f, to engage with the external thread g of a tubular bearing G, the smooth longitudinal bore of which II is traversed by the shaft I, having a grinderc at its lower end. Furthermore, the screw 9 of shaftbearing G has a left-hand thread, for a purpose that will presently appear.

J is a customary swing-lid pivoted to the mill, as shown at j in Fig. 2.

K is a non-circular nut or collar on the upper end of the shaft-bearing G, which collar supports the hub Z of the operating-crank L; but, if desired, a washer M may be interposed between said collar and hub. I-Iub Z is engaged With a screw-threaded shank '6 of the shaft I, said screw 2" being right-handed.

N is a cast handle integral with the cover E and having a base-plate n, which is perforated to admit one or more screws 0, wherewith said plate is fastened to the top of the mill-box. It is evident the handle N aifords a convenient grasping device for holding the mill immovably when in operation, the grinding being effected by turning the crank L in the usual direction; but this turning of said crank will not loosen the shaft-bearing G,be-

cause its screw-thread g is left-hande(1. "Therefore, after the feed of the mill has once been regulated there is no danger of it being accidentally disarranged.

To adjust the grinding-cone when occasion requires, the collar K is grasped with a suitable implement, and the shaft-bearing G is then screwed either up or down, so as to raise or lower the shaft I, and thus cause the grinder i to approach the concave a or to recede therefrom, the downward prolongation of said bearing afiording an extended guide for said shaft, and thereby centralizing the latter within the hopper. Consequently the grinding-surfaces a i are caused to wear evenly.

I claim as my invention-- 1. The combination, in a coffee-mill, of hopper A, having a concave ct, the fixed hopper-cover E, having an internally-threaded neck F f, the longitudinally-adjustable sl1aftbearing G H, engaged With said neck by the left-hand thread g, the shaft I, journaled in the bore H of said bearing and having at its lower end a grinder c and at its upper end a right-hand-threaded shank i, and a crank L, having a screw-threaded hub Z, engaged with said shank, all as herein described, and for the purpose stated.

2. In a coffee-mill, the hopper-cover E, having an integral handle N, provided with a perforated base-plate n, that rests upon the box-top O and is secured thereto by fasteners O, as herein described.

In testimonywhereof I affix my signature in 

